docs: def modify(LowLayerCompatibility_presence=0,
             HighLayerCompatibility_presence=0,
             ReverseCallSetupDirection_presence=0):
      """MODIFY Section 9.3.13"""
      a = TpPd(pd=0x3)
      b = MessageType(mesType=0x17)  # 00010111
      c = BearerCapability()
      packet = a / b / c
      if LowLayerCompatibility_presence is 1:
          d = LowLayerCompatibilityHdr(ieiLLC=0x7C, eightBitLLC=0x0)
          packet = packet / d
      if HighLayerCompatibility_presence is 1:
          e = HighLayerCompatibilityHdr(ieiHLC=0x7D, eightBitHLC=0x0)
          packet = packet / e
      if ReverseCallSetupDirection_presence is 1:
          f = ReverseCallSetupDirectionHdr(ieiRCSD=0xA3)
          packet = packet / f
      return packet